Green’s Dictionary of Slang

moosey n.

(US) the vagina.

1953

Randolph & Wilson Down in the Holler 105: The word satchel is best avoided because it means the pudendum, also known as the pussy, twat, snatch, monkey, moosey, or twitchet.

In compounds

moosey-faced (adj.)

a general term of abuse, lit. ‘vagina-faced’.

1998		I. Welsh Filth 204: Lennox has taken the hump big-time, the moosey-faced rat-bag.
2015		I. Welsh Decent Ride 113: Ah picks up a fare oan London Road. It’s another moosey-faced cunt.